Strange interstellar comet speculated to be alien spacecraft is older than Solar System - Scientists say comet represents preserved fragment of ancient planetary system ...

Avi Loeb, a Harvard astronomer who has made headlines with his theories about alien encounters, will lead a White House ...

Last year, an interstellar traveler entered our solar system. Some speculated that it was an alien spacecraft, but it turned ...

PARIS, France — An interstellar comet that blazed past the Sun last year could be nearly three times older than our Solar System and is unlike anything ever before seen in our cosmic backyard, ...

A strange class of comet could explain the enigmatic behavior of ‘Oumuamua, the first known interstellar object—and even shed ...

Based on evidence collected by the James Webb Space Telescope, researchers have found that interstellar comet 3I/ATLAS could be up to 12 billion years old!

Exactly where the comet 3I/ATLAS came from within the Milky Way remains a mystery.

It was initially thought to have formed between three and 10 billion years ago, but researchers have now found that it could be even older, originating from an ancient planetary system nearly 12 ...

Astronomers turned the Allen Telescope Array toward interstellar comet 3I/ATLAS, formally designated C/2025 N1 (ATLAS), searching for narrowband radio signals that could indicate alien technology ...

Avi Loeb is leading a new Science Advisory Council tasked with finding the origin of unidentified objects spotted by military pilots and others. It's part of a broader White House effort studying ...

Now is your chance to see a comet that takes more than five years to return to Earth's cosmic neighborhood. Here's what to know about Comet 10P/Tempel 2.